Trace wheel through pivot paper, line A to BP.

用擂盘在旋转纸上画线，从A1点到胸点。

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Remove the pivot paper. Use a pencil to mark over trace-wheel lines.

移动旋转纸。用锅笔标出擂盘线。

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Remove the pivot paper. Use a pencil to mark over trace-wheel lines.

移动旋转纸。用锅笔标出擂盘线。

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